A stuck egr valve will not move under any engine vacuum source.Went out this morning and did manage to get the EGR valve off without in problems. I tested the solenoid with 12 volts and it clicked so I assume it is functioning properly. I tested the solenoid plug for volts but did not detect any voltage by just turning the key on. Based on everyone’s description of when the solenoid usually operates I didn’t really expect to see any voltage but decided to make the test anyway. I did attempt to test out the EGR valve itself. I hooked it up to a good valcuum source on another vehicle and could not detect any movement. I could actually suck on a hose connected to the EGR and draw air, very much restricted but I could get air. Does it sound like the EGR valve is most likely the source of my problem? I would appreciate everyone’s thoughts on what I have determined so far with my testing. Is there other tests I should make before I get a replacement EGR valve? Thanks,
You will never suck it open.
It might be bad but it might just be carbon crudded.
The reason to try to save your old EGR valve is that the new ones are absolute garbage.
You can clean a stuck egr valve if you are very carefull about it.
The manifold side of the egr diaphram will have a ring of carbon the prevents the diaphram from seating properly
And some of that carbom will leak past and crud up the seal making it all stick in place.
Soak the egr in brake clean or carb cleaner or whatever your solvent of choice.
After it soaks for a long time.
Stick your fingers in the holes and gently push on the outer rim of the diaphram.
Do not touch the diaphragm
If it doesnt move at all.
Soak it some more.
The idea is to get the inside of the egr clean enough the the diapragm can move through its entire travel.
I bet it is stuck in place.
If you can get it to start moving, get a "mighty vac" kit
About 40 bucks and a very usefull tool to own.
attach the mighty vac to the vacuum port on the egr valve and see if it moves.
About 12 inches of vacuum wil tell you the whole story.
If you can move the diapragm through its entire travel and the spring returns it to its normally closed position but it will not hold vacuum?
It has a hole in it.
If it will hold 12 inches and doesnt bleed down you can hold that diaphragm open under vacuum and carefully scrape the carbon ring off of the inside of the housing.
A dirty carbon stuck egr will always fail a vacuum test.
Because the carbon buildup keeps it from sealing.
I am at about 270k on the factory EGR valve.
But. I also pull the tbi every year and I do the all of the sensors inputs and normal cap rotor plug wires twice a year.
Because of 10 percent ethylated gas and chinese parts and at some point I will loose my mind and get arrested at the Advanced Orielly Napa Zone when they tell me that there is no such thing as anti-seize compound.
Yep. That happened.
Save your trucks and save your parts and stockpile the OEM stuff whenever you can find it.
Im getting old and Im starting to see a future where us old guys get sent to prison becuase our motorized wheelchairs stopped working and we choke people while screaming "Its the Grounds you dense turd"
"Its the Grounds"